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#include "scan.h"
#include "byte.h"
#include "case.h"
#include <time.h>
static int parsetime(const char*c,struct tm* x) {
unsigned long tmp;
c+=scan_ulong(c,&tmp); x->tm_hour=tmp;
if (*c!=':') return -1; ++c;
c+=scan_ulong(c,&tmp); x->tm_min=tmp;
if (*c!=':') return -1; ++c;
c+=scan_ulong(c,&tmp); x->tm_sec=tmp;
if (*c!=' ') return -1;
return 0;
}
unsigned int scan_httpdate(const char *in,time_t *t) {
struct tm x;
int i;
unsigned long tmp;
const char* c;
static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
if (!(c=in)) return 0;
if (c[3]==',') c+=5; else
if (c[6]==',') c+=8; else {
c+=4;
for (i=0; i<12; ++i) {
if (case_equalb(c,3,months+i*3)) {
x.tm_mon=i; break;
}
}
c+=4; if (*c==' ') ++c;
c+=scan_ulong(c,&tmp); x.tm_mday=tmp;
++c;
if (parsetime(c,&x)) return 0;
c+=9;
c+=scan_ulong(c,&tmp); x.tm_year=tmp-1900;
goto done;
}
c+=scan_ulong(c,&tmp); x.tm_mday=tmp;
++c;
for (i=0; i<12; ++i)
if (case_equalb(c,3,months+i*3)) {
x.tm_mon=i; break;
}
c+=4;
c+=scan_ulong(c,&tmp);
if (tmp>1000) x.tm_year=tmp-1900; else
if (tmp<70) x.tm_year=tmp+100; else
x.tm_year=tmp;
++c;
if (parsetime(c,&x)) return 0;
c+=9;
if (byte_equal(c,3,"GMT")) c+=3;
done:
x.tm_wday=x.tm_yday=x.tm_isdst=0;
*t=mktime(&x);
return c-in;
}
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